2014/12/30 by A. Ballestar, Ana Ballestar, P. Esquinazi +2
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Composite material #Condensed matter physics #Electrical resistivity and conductivity #Electronic and Structural Properties of Oxides #Graphene #Graphene research and applications #Graphite #Highly oriented pyrolytic graphite #Magnetic field #Materials science #Nanotechnology #Physics #Pyrolysis #Pyrolytic carbon #Superconductivity #Surface and Thin Film Phenomena #Transmission electron microscopy #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.91.014502
5 figures, to be published in Phys. Rev. B
arxiv created 2014/12/30 · openalex publication_date 2015/01/07 · arxiv updated 2015/06/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We have studied the transport properties of transmission electron microscope (TEM) lamellae obtained from a pyrolytic graphite sample of grade B (SPI-II) with electrical contacts at the edges of the graphene layers. The temperature, magnetic field, input current dependence of the resistance as well as the current-voltage characteristic curves are compatible with the existence of granular superconductivity below 5 K. TEM pictures of the studied lamellae reveal clear differences of the embedded interfaces to those existing in more ordered pyrolytic samples, which appear to be the origin for the relatively lower temperatures at which the granular superconductivity is observed.